JP2015211088A - Device and system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect abnormality of a filter accurately.SOLUTION: A filter 113 is provided at the intake position of a rack 110 for housing a first electronic device 111. A first measurement section 121 measures the temperature of the first electronic device 111. A second measurement section 122 measures the temperature on the periphery of the first electronic device 111. A determining section 124 determines whether or not the surface temperature has exceeded a predetermined temperature dependent on the peripheral temperature, based on each temperature measured by the first measurement section 121 and second measurement section 122 when air is taken into the rack 110 from the intake position by means of a fan 114. When a determination is made that the surface temperature has exceeded a predetermined temperature in the determining section 124, an output section 125 outputs a signal indicating abnormality of the filter 113.

Description

  The present invention relates to an apparatus and system for cooling an electronic device.

  2. Description of the Related Art Conventionally, there is a cooling method in which a dustproof filter is provided at the suction port, air is sent into the apparatus using a plurality of fans, and the number of rotations of the fan is controlled using temperature sensor information in a card mounted in the apparatus. (For example, see Patent Document 1 below.) A device that prompts the filter to be cleaned or replaced when the allowable temperature value in the housing is exceeded for a certain period of time while the rotational speed of the fan is controlled according to the temperature change of the temperature sensor in the housing. (For example, see Patent Document 2 below). These cooling devices such as fans are also provided in, for example, base stations that are installed outdoors and perform wireless communication with mobile terminals.

International Publication No. 2004/0775615 JP 2009-205240 A

  However, with the conventional technology, for example, if the temperature around the electronic device changes due to differences in time, season, etc., it is difficult to distinguish between filter abnormalities and ambient temperature fluctuations, and filter abnormalities can be detected accurately. There are cases where it is not possible.

  In one aspect, an object of the present invention is to accurately detect a filter abnormality.

  According to one aspect of the present invention, based on the temperature of the electronic device and the temperature around the electronic device measured when air is taken into the rack by a blower from the intake position of the rack that houses the electronic device. Determining whether or not the temperature of the electronic device has exceeded a predetermined temperature corresponding to the ambient temperature, and determining that the temperature of the electronic device has exceeded the predetermined temperature. An apparatus and system is proposed that outputs a signal indicating an abnormality of the filter being used.

  According to one embodiment of the present invention, a filter abnormality can be detected with high accuracy.

FIG. 1 is a block diagram of an example of a functional configuration of the control device according to the first embodiment. FIG. 2 is an explanatory diagram of an example of a functional configuration of the control system according to the first embodiment. FIG. 3 is an explanatory diagram illustrating an example of the configuration of the control device. FIG. 4 is an explanatory diagram of an example of the configuration of the control system according to the first embodiment. FIG. 5 is an explanatory diagram of an example of the storage contents of the device allowable temperature table according to the first embodiment. FIG. 6 is an explanatory diagram illustrating an example of a hardware configuration of the control card. FIG. 7 is a flowchart of an example of a filter abnormality detection process performed by the control device according to the first embodiment. FIG. 8 is an explanatory diagram of an example of the configuration of the control system according to the second embodiment. FIG. 9 is an explanatory diagram of an example of the storage contents of the device allowable temperature table according to the second embodiment. FIG. 10A is a flowchart (part 1) illustrating an example of a filter abnormality detection process performed by the control device according to the second embodiment. FIG. 10B is a flowchart (part 2) illustrating an example of a filter abnormality detection process performed by the control device according to the second embodiment. FIG. 11 is an explanatory diagram of an example of the configuration of the control system according to the third embodiment. FIG. 12 is an explanatory diagram of an example of the contents stored in the excess threshold table. FIG. 13A is a flowchart (part 1) illustrating an example of a filter abnormality detection process performed by the control device according to the third embodiment. FIG. 13B is a flowchart (part 2) illustrating an example of a filter abnormality detection process performed by the control device according to the third embodiment. FIG. 14 is an explanatory diagram of an example of a configuration of a control system according to the fourth embodiment. FIG. 15 is an explanatory diagram of an example of the contents stored in the difference allowance table. FIG. 16 is a flowchart illustrating an example of a filter abnormality detection process performed by the control device according to the fourth embodiment.

  Hereinafter, preferred embodiments 1 to 4 of the disclosed technology will be described in detail with reference to the drawings.

(Embodiment 1)
(Functional configuration of the device)
First, a device according to the first embodiment (hereinafter referred to as “control device”) will be described. FIG. 1 is a block diagram of an example of a functional configuration of the control device according to the first embodiment. As shown in FIG. 1, the control device 100 is also provided in a base station that is installed outdoors and performs wireless communication with a mobile terminal, for example. The control apparatus 100 includes a first electronic device 111, a second electronic device 112, a filter 113, a blower 114, a first measurement unit 121, a second measurement unit 122, and a third measurement unit in a rack 110. 123, a determination unit 124, an output unit 125, a storage unit 126, a control unit 127, and an ambient temperature sensor 131.

  The rack 110 accommodates the first electronic device 111 and the second electronic device 112. Hereinafter, the first electronic device 111 and the second electronic device 112 will be described only for the first electronic device 111 unless otherwise specified. However, the second electronic device 112 is the same as the first electronic device 111. The first electronic device 111 is, for example, a DSP (Digital Signal Processor) provided on a card such as a plug-in unit.

  The filter 113 is provided at the intake position of the rack 110. The intake position is a position where air is taken into the rack 110. The filter 113 removes dust from the outside. The blower 114 takes air into the rack 110. The blower 114 may be provided in the rack 110 or may be provided outside the rack 110. The blower 114 takes air from the intake position and discharges the taken air from the exhaust position. The blower 114 only needs to be able to take air into the rack 110 and may be provided on the intake side or may be provided on the exhaust side. The blower 114 is a fan or a blower, for example.

  The surface temperature of the first electronic device 111 rises due to heat generation during operation of the first electronic device 111. Therefore, the surface temperature of the first electronic device 111 is cooled by blowing air from the blower 114.

  The first measurement unit 121 measures the temperature of the first electronic device 111. The first measurement unit 121 measures the temperature of the first electronic device 111 with a temperature sensor built in the first electronic device 111. The temperature of the first electronic device 111 is the surface temperature of the first electronic device 111 or the temperature inside the first electronic device 111. Hereinafter, the temperature of the first electronic device 111 will be described as “surface temperature”.

  The second measuring unit 122 measures the ambient temperature of the electronic device. The second measurement unit 122 measures the ambient temperature of the first electronic device 111 with the ambient temperature sensor 131. The ambient temperature is a temperature of a portion that is not in direct contact with the first electronic device 111 and is a temperature that affects the surface temperature of the first electronic device 111. The arrangement position of the ambient temperature sensor 131 may be a position where the ambient temperature of the first electronic device 111 can be measured, and may be a position affected or not affected by the wind from the blower 114.

  The determination unit 124 acquires each temperature measured by the first measurement unit 121 and the second measurement unit 122 when air is taken into the rack 110 from the intake position by the blower 114. The determination unit 124 determines whether or not the surface temperature of the first electronic device 111 exceeds a predetermined temperature corresponding to the ambient temperature based on the acquired temperatures. The predetermined temperature differs depending on the ambient temperature. For example, when the ambient temperature is low, the predetermined temperature is lower than when the ambient temperature is high. For example, the predetermined temperature is lower in winter than in summer.

  Based on each acquired temperature, for example, is based on a comparison between the ambient temperature, the threshold value, and the surface temperature of the first electronic device 111. For example, the determination unit 124 acquires a threshold value corresponding to the ambient temperature measured by the second measurement unit 122 from the storage unit 126 that stores correspondence information in which the ambient temperature is associated with the threshold value (allowable temperature). The correspondence information may be associated with a table or may be obtained by calculation.

  Then, the determination unit 124 determines whether the surface temperature of the first electronic device 111 exceeds a predetermined temperature based on the comparison between the acquired threshold value and the surface temperature of the first electronic device 111. That is, the determination by the determination unit 124 as to whether or not the surface temperature of the first electronic device 111 exceeds a predetermined temperature corresponding to the ambient temperature is based on the surface temperature of the first electronic device 111 and the threshold value corresponding to the ambient temperature. Use direct judgment by comparison.

  Moreover, based on each acquired temperature is good also as based on the comparison using the correction value according to ambient temperature, a predetermined threshold value, and the surface temperature of the 1st electronic device 111, for example. For example, the determination unit 124 corrects the surface temperature with a correction value corresponding to the ambient temperature, and compares the corrected value with a certain threshold value to determine whether the surface temperature of the first electronic device 111 exceeds a predetermined temperature. It may be judged.

  For example, the determination unit 124 corrects the comparison result between the constant threshold value and the surface temperature of the first electronic device 111 with a correction value according to the ambient temperature, and based on the corrected value, It may be determined whether or not the surface temperature exceeds a predetermined temperature. That is, the determination by the determination unit 124 as to whether or not the surface temperature of the first electronic device 111 has exceeded a predetermined temperature corresponding to the ambient temperature is determined based on the correction value corresponding to the ambient temperature, the predetermined threshold, and the first electronic device 111. The surface temperature may be used as an indirect determination.

  The output unit 125 outputs a signal indicating an abnormality of the filter 113 when the determination unit 124 determines that the surface temperature of the first electronic device 111 exceeds a predetermined temperature. The abnormality of the filter 113 is clogging of the filter due to dust or the like, for example. The signal indicating the abnormality of the filter 113 may be a signal indicating that the filter is clogged. For example, the filter is replaced, the filter is cleaned, the operation of the control device 100 is turned off, etc. This signal requests switching to a spare device.

  Here, although details will be described later in Embodiment 2, a case will be described in which abnormality of the filter 113 is detected by changing the rotation speed of the blower 114 to a plurality of stages and changing the rotation speed of the blower 114.

  The control unit 127 controls the air volume of the blower 114 according to the surface temperature of the first electronic device 111. The air volume of the blower 114 is, for example, an air volume of two or more stages including high speed and low speed. For example, when the surface temperature of the first electronic device 111 becomes high, the control unit 127 increases the air volume of the blower 114.

  The determination unit 124 determines whether or not the control state of the air volume controlled by the control unit 127 is a predetermined state and the surface temperature of the first electronic device 111 exceeds a predetermined temperature corresponding to the ambient temperature. The control state of the air volume is a predetermined state, for example, a high speed state.

  The output unit 125 outputs a signal indicating an abnormality of the filter 113 when the determination unit 124 determines that the control state is the predetermined state and the surface temperature of the first electronic device 111 exceeds the predetermined temperature. Specifically, the output unit 125 outputs a signal indicating an abnormality of the filter 113 when the air volume control state is a high speed state and the surface temperature of the first electronic device 111 exceeds a predetermined temperature. To do.

  The signal output from the output unit is output to a notification unit such as a display (not shown) included in the control device 100, and the notification unit notifies the abnormality of the filter 113. The signal output from the output unit is transmitted from a transmission unit (not shown) to a monitoring device 230 (see FIG. 2) as a second device that manages the control device 100 via a network or a dedicated line.

  Then, in the device to which this signal is transmitted, an abnormality in the filter 113 is notified to a maintenance person or the like from a notification unit such as a display. The network is, for example, a WAN (Wide Area Network) or a LAN (Local Area Network). The dedicated line is, for example, a line that connects two devices, the control device 100 and the monitoring device 230.

  On the other hand, the output unit 125 does not output a signal indicating an abnormality of the filter 113 when the determination unit 124 does not determine that the control state is the predetermined state and the surface temperature of the first electronic device 111 exceeds the predetermined temperature. Specifically, the output unit 125 does not output a signal indicating an abnormality of the filter 113 when the control state is not a high speed state or when the surface temperature of the first electronic device 111 does not exceed a predetermined temperature.

  As a result, a signal indicating abnormality of the filter 113 can be output only when the control state of the air volume controlled by the control unit 127 is in a predetermined state, and a condition for determining whether or not to output a signal indicating abnormality of the filter 113 is determined. Can be aligned. For this reason, the detection accuracy of the abnormality of the filter 113 can be improved. Note that the predetermined state of the airflow control state is not limited to the high speed state, and may be a low speed state, for example, as long as the determination condition for determining whether or not to output a signal indicating abnormality of the filter 113 can be satisfied.

  Further, the determination unit 124 determines that the airflow control state is not a predetermined state and the surface temperature of the first electronic device 111 is a predetermined temperature (here, “first predetermined temperature”) according to the ambient temperature of the first electronic device 111. It is determined whether or not a second predetermined temperature that is the same as or different from the above is exceeded. If this determination is affirmative, the determination unit 124 sets the air volume control state to a predetermined state, and determines whether or not the surface temperature of the first electronic device 111 exceeds the first predetermined temperature.

  The second predetermined temperature is a threshold for increasing the air volume. The second predetermined temperature varies depending on the ambient temperature. For example, when the ambient temperature is low, the second predetermined temperature is lower than when the ambient temperature is high. Specifically, the second predetermined temperature is lower in winter than in summer, like the first predetermined temperature. The second predetermined temperature is, for example, the same temperature as the first predetermined temperature or a temperature lower than the first predetermined temperature. When the air volume is low and the surface temperature of the first electronic device 111 exceeds the second predetermined temperature, the determination unit 124 increases the air volume and determines whether the surface temperature of the first electronic device 111 exceeds the first predetermined temperature. Judge whether or not.

  Thereby, for example, when the ambient temperature is low, the threshold value (second predetermined temperature) for setting the air volume control state to a predetermined state can be lowered, and the abnormality detection accuracy of the filter 113 can be improved. In the following description, unless otherwise specified, the predetermined temperature and the first predetermined temperature are assumed to be the same.

  Here, although details will be described later in the third embodiment, the determination time of the surface temperature of the first electronic device 111 is changed based on the amount of change in the surface temperature of the first electronic device 111, and the abnormality of the filter 113 is detected. The case of detecting the will be described.

  The determination unit 124 determines whether or not the duration of the state in which the surface temperature of the first electronic device 111 exceeds the predetermined temperature is equal to or longer than the determination time according to the amount of change in the surface temperature of the first electronic device 111. . The fluctuation amount is, for example, a change rate indicating an increase or decrease in temperature per predetermined time. For example, when a plurality of determinations are made, the determination time can be represented by a time for making one determination (excess timer threshold described later) and a number of determinations (excess counter threshold described later).

  The determination time includes a determination time corresponding to a predetermined amount of variation (referred to as “first determination time”), a determination time corresponding to a variation smaller than the predetermined amount and longer than the first determination time (“second determination time”). Referred to as “time”). The fluctuation amount of the predetermined amount is, for example, a fluctuation amount indicating a sudden change. The fluctuation amount smaller than the predetermined amount is, for example, a fluctuation amount indicating a gradual change. The determination time corresponding to the fluctuation amount indicating a rapid change is short, and the determination time corresponding to the fluctuation amount indicating a gradual change is long.

  The output unit 125 outputs a signal indicating an abnormality of the filter 113 when the determination unit 124 determines that the duration of the state where the surface temperature of the first electronic device 111 exceeds the predetermined temperature is equal to or longer than the determination time. . For example, since the determination time corresponding to the fluctuation amount indicating a rapid change is short, a signal indicating an abnormality of the filter 113 can be output when the above-described duration is equal to or longer than the short determination time. Therefore, in the case of a fluctuation amount indicating a sudden change, a signal indicating an abnormality of the filter 113 can be output immediately.

  Further, the determination time may be set to 0. For example, in the case of a fluctuation amount indicating a rapid change, the determination time is set to 0, and the output unit 125 is not determined whether or not the duration time is equal to or longer than the determination time. However, a signal indicating an abnormality of the filter 113 may be output. As a result, in the case of a fluctuation amount indicating a sudden change, a signal indicating abnormality of the filter 113 can be output immediately.

  On the other hand, the output unit 125 outputs a signal indicating an abnormality of the filter 113 when the determination unit 124 does not determine that the duration of the state where the surface temperature of the first electronic device 111 exceeds the predetermined temperature is longer than the determination time. do not do. Specifically, if the surface temperature of the first electronic device 111 does not exceed a predetermined temperature before the determination time has elapsed, a signal indicating an abnormality of the filter 113 is not output. For example, since the determination time corresponding to the fluctuation amount indicating a gradual change is long, accurate abnormality detection can be performed, and the abnormality detection accuracy of the filter 113 can be improved.

  In addition, the determination unit 124 changes the determination time according to the amount of change within the determination time. For example, when the variation amount within the determination time is a variation amount indicating a rapid change, the determination time is shortened. When the fluctuation amount within the determination time is a fluctuation amount indicating a gradual change, the determination time is lengthened. For example, the storage unit 126 stores correspondence information in which the variation amount and the determination time are associated with each other. The determination unit 124 acquires the determination time corresponding to the variation amount within the determination time from the storage unit 126, and changes the acquired determination time.

  Here, although details will be described later in the fourth embodiment, an abnormality of the filter 113 is detected based on a comparison between the difference between the surface temperatures of the first electronic device 111 and the second electronic device 112 and an allowable difference value. The case will be described.

  The third measurement unit 123 measures the surface temperature of the second electronic device 112. The first electronic device 111 and the second electronic device 112 have different distances from the intake position. When the filter 113 is clogged, the first electronic device 111 and the second electronic device 112 differ in the air volume at each arrangement position compared to the case where the filter 113 is not clogged.

  The second electronic device 112 is disposed closer to the intake position than the first electronic device 111. Since the first electronic device 111 and the second electronic device 112 have different distances from the intake position, when the filter 113 is clogged, the air volume in each of the first electronic device 111 and the second electronic device 112 is larger than that when the filter 113 is not clogged. change. For this reason, a difference occurs in the difference in surface temperature between when the filter 113 is clogged and when it is not clogged.

  Each difference in surface temperature is a predetermined difference. For example, since the first electronic device 111 is arranged farther from the intake position than the second electronic device 112, the air volume is smaller than that of the second electronic device 112 when the filter 113 is clogged, that is, the cooling performance. The surface temperature difference increases.

  The determination unit 124 determines whether or not the difference between the surface temperatures measured by the first measurement unit 121 and the third measurement unit 123 exceeds a predetermined value. The predetermined value is an allowable difference value, and since the arrangement position of each electronic device 111 and 112 and the degree of temperature rise of each electronic device 111 and 112 itself are different, each combination of the electronic devices 111 and 112 is different. The value to be set. The determination unit 124 determines whether or not the difference in surface temperature between the electronic devices 111 and 112 exceeds a predetermined value corresponding to the combination of the electronic devices 111 and 112.

  The output unit 125 outputs a signal indicating an abnormality of the filter 113 when the determination unit 124 determines that the difference between the surface temperatures exceeds a predetermined value. On the other hand, the output unit 125 may not output a signal indicating an abnormality of the filter 113 when the determination unit 124 does not determine that the difference in surface temperature exceeds a predetermined value.

  As described above, the abnormality of the filter 113 is detected using not only the allowable temperature according to the ambient temperature of the first electronic device 111 but also the difference between the surface temperature of the second electronic device 112 and the predetermined value. Thereby, the variation of the abnormality detection of the filter 113 can be increased, and the abnormality of the filter 113 can be easily detected.

  In addition, the determination unit 124 determines whether the surface temperatures measured by the first measurement unit 121 and the third measurement unit 123 do not exceed a predetermined temperature, and whether the difference between the surface temperatures exceeds a predetermined value. You may judge. In this case, the output unit 125 outputs a signal indicating an abnormality of the filter 113 when the determination unit 124 determines that each surface temperature does not exceed the predetermined temperature and the difference in surface temperature exceeds the predetermined value. To do. On the other hand, the output unit 125 does not output a signal indicating an abnormality of the filter 113 when the determination unit 124 does not determine that the respective surface temperatures exceed the predetermined temperature and the difference in surface temperature exceeds the predetermined value.

  With such a configuration, even when the surface temperature of the first electronic device 111 does not exceed the threshold value according to the ambient temperature, the difference between the surface temperature of the second electronic device 112 and the comparison result with the predetermined value is used. Thus, the abnormality of the filter 113 can be detected.

  In addition, the determination unit 124 determines whether the difference between the surface temperatures measured by the first measurement unit 121 and the third measurement unit 123 exceeds a predetermined value, and whether at least one of the surface temperatures exceeds the predetermined temperature. It may be judged. In this case, the output unit 125 outputs a signal indicating an abnormality of the filter 113 when the determination unit 124 determines that the difference in surface temperature exceeds a predetermined value and at least one of the temperatures exceeds the predetermined temperature. Output. The output unit 125 does not output a signal indicating an abnormality of the filter 113 when the determination unit 124 determines that the difference in surface temperature exceeds a predetermined value and at least one of the surface temperatures does not exceed the predetermined temperature. .

  With such a configuration, when the surface temperature of the first electronic device 111 exceeds a threshold value corresponding to the ambient temperature and the difference in surface temperature from the second electronic device 112 exceeds a predetermined value, the filter 113. Abnormalities can be detected. Therefore, it is possible to improve the detection accuracy of the abnormality of the filter 113.

(Example of functional configuration of the system)
Next, a system according to the first embodiment (hereinafter referred to as “control system”) will be described. FIG. 2 is an explanatory diagram of an example of a functional configuration of the control system according to the first embodiment. The control system 200 includes a base station control device 210, a base station 220, a monitoring device 230, and a terminal device 240. The base station controller 210 is connected to the base station 220 and manages the base station 220. The base station 220 communicates wirelessly with a terminal device 240 such as a mobile phone. Further, the base station control device 210 is connected to the monitoring device 230 and transmits, for example, the communication status to the monitoring device 230. The monitoring device 230 is managed by an operator, for example, and monitors the base station control device 210 and the base station 220.

  The base station 220 includes a control device 100, an HWY-INF (High Way-Interface) receiving unit 221, a baseband signal processing unit 222, an RF (Radio Frequency) transmitting unit 223, an antenna 224, an antenna 225, The RF reception unit 226, the baseband signal processing unit 227, the HWY-INF transmission unit 228, the scheduler unit 229, and the control card 250 are included.

  The HWY-INF receiving unit 221 is an inter-station transmission path interface unit, and performs, for example, ATM (Asynchronous Transfer Mode) processing, clock extraction from the transmission path, and the like, and outputs the processed signal to the baseband signal processing unit 222 To do. The baseband signal processing unit 222 performs processing such as error correction coding, radio framing, data modulation, frequency conversion, and time conversion on the signal input from the HWY-INF receiving unit 221, for example. The transmission baseband signal is output to the RF transmission unit 223.

  For example, the RF transmission unit 223 converts the transmission baseband signal input from the baseband signal processing unit 222 into a transmission RF signal by orthogonal modulation, and outputs the transmission RF signal to the antenna 224. The antenna 224 transmits the signal input from the RF transmission unit 223 by radio.

  The antenna 225 receives a signal from the terminal device 240 by radio, and outputs the received signal to the RF receiving unit 226. For example, the RF receiving unit 226 performs A / D conversion on the received RF signal input from the antenna 225 and outputs it to the baseband signal processing unit 227. The baseband signal processing unit 227 performs processing such as time conversion, frequency conversion, data demodulation, signal separation, and error correction coding on the received RF signal input from the RF receiving unit 226, and the processed signal is converted to HWY. -Output to the INF transmission unit 228 and the scheduler unit 229.

  The HWY-INF transmission unit 228 is an inter-station transmission path interface unit, and outputs the signal input from the baseband signal processing unit 227 to the base station control apparatus 210. For example, the scheduler unit 229 performs transmission control for performing retransmission of erroneous data to the baseband signal processing unit 222 based on the reception error detection result after the error correction code in the baseband signal processing unit 227, scheduling, and the like. Etc.

  In addition, the control device 100 includes a control card 250. The control card 250 is a plug-in unit in which an electronic component is mounted on a printed board, for example. The control card 250 detects an abnormality of the filter when the surface temperature of the electronic device (hereinafter referred to as “device”) exceeds the allowable temperature of the surface of the device according to the ambient temperature.

(Configuration of control device)
FIG. 3 is an explanatory diagram illustrating an example of the configuration of the control device. As shown in FIG. 3, the control device 100 includes a rack 301, a dustproof filter 302, a fan unit 303, a card 304, and an ambient temperature sensor 312. The rack 301 is provided with a dustproof filter 302 on the intake side. The dust filter 302 removes dust during intake. The filter 113 shown in FIG. 1 is realized by a dust filter 302.

  The rack 301 is provided with a plurality of fan portions 303 on the exhaust side. The fan unit 303 has a blowing function, takes air from the intake side, and discharges the taken air from the exhaust port. The blower 114 illustrated in FIG. 1 is realized by the fan unit 303.

  A plurality of cards 304 are accommodated in the rack 301. A device such as a DSP is provided on the surface of each card 304. The surface temperature of each card 304 rises due to heat generation during operation of the device. Therefore, each card 304 is cooled by the air blown by the fan unit 303.

  The card 304 is provided with a device temperature sensor 311 for measuring the surface temperature of the device. The device temperature sensor 311 is built in, for example, a DSP. The ambient temperature sensor 312 measures the ambient temperature of the card 304 in the rack 301. The arrangement position of the ambient temperature sensor 312 may be a position where the ambient temperature of the card 304 can be measured, and may be a place where the fan unit 303 is affected or not affected by the wind.

  For example, one of the plurality of cards 304 is the control card 250. The control card 250 is clogged in the dustproof filter 302 when the surface temperature of the device detected by the device temperature sensor 311 for each card 304 exceeds an allowable temperature corresponding to the ambient temperature detected by the ambient temperature sensor 312. It is determined that there is. The allowable temperature is a temperature set for each card 304 (for each device). For example, the allowable temperature is set according to the upper limit temperature of the device, the air volume, the ambient temperature, the rotational speed of the fan unit 303, and the like. The allowable temperature is set based on the surface temperature of the device that is assumed when the maximum load is obtained by thermal simulation or the like in advance.

  In FIG. 3, the fan unit 303 is provided on the exhaust side, but the configuration is not limited thereto, and may be provided on the intake side. Further, although a plurality of fan units 303 are provided, a single unit may be used. Further, the dust filter 302 may be a single filter or a plurality of dust filters may be provided for each intake port when a plurality of intake ports are provided.

(Configuration of control system according to the first embodiment)
FIG. 4 is an explanatory diagram of an example of the configuration of the control system according to the first embodiment. In FIG. 4, the control card 250 includes a temperature collection unit 401, a filter replacement determination unit 402, and a device allowable temperature table 403. The temperature collection unit 401 collects device surface temperature detection results from the device temperature sensors 311 of the plurality of cards 304. The temperature collection unit 401 collects the detection result of the ambient temperature of the card 304 from the ambient temperature sensor 312.

  The temperature collection unit 401 outputs the collected detection results of each temperature to the filter replacement determination unit 402. The filter replacement determination unit 402 compares the surface temperature of each card 304 detected by the device temperature sensor 311 with the allowable temperature stored in the device allowable temperature table 403, and determines whether it is time to replace the dustproof filter 302. Determine whether or not. The device allowable temperature table 403 is a table in which the ambient temperature is associated with the allowable temperature of each device (see FIG. 5).

  Specifically, the filter replacement determination unit 402 determines whether or not the surface temperature of each card 304 detected by the device temperature sensor 311 has exceeded each allowable temperature corresponding to the ambient temperature detected by the ambient temperature sensor 312. judge. The filter replacement determination unit 402 determines that it is time to replace the dustproof filter 302 when the surface temperature exceeds the allowable temperature.

  When it is determined that it is time to replace the dustproof filter 302, the filter replacement determination unit 402 causes the monitoring device 230 to notify the filter replacement via the network 410 including the base station control device 210, for example. In addition, when it is determined that it is time to replace the dustproof filter 302, the filter replacement determination unit 402 causes a notification unit (not illustrated) included in the control device 100 to perform filter replacement notification. In response to this notification, the maintenance person replaces the dustproof filter 302.

  The first measurement unit 121, the second measurement unit 122, and the third measurement unit 123 illustrated in FIG. 1 are realized by the temperature collection unit 401. The determination unit 124 and the output unit 125 are realized by the filter replacement determination unit 402.

(Example of stored contents of device allowable temperature table according to the first embodiment)
FIG. 5 is an explanatory diagram of an example of the storage contents of the device allowable temperature table according to the first embodiment. In FIG. 5, the device allowable temperature table 403 has an ambient temperature field and an allowable temperature field for each device. By setting information in these fields, the device allowable temperature table 403 stores temperature data 501-1 to 501-x for each combination of the ambient temperature and the allowable temperature of each device.

  The ambient temperature is the ambient temperature of the card 304 (device). The ambient temperature is assumed to be the coldest temperature in winter and the hottest temperature in summer, and is expressed, for example, at 1 ° C. intervals of 5 ° C., 6 ° C.,. The temperature for each device is an allowable temperature of the surface of each device. For example, it is assumed that one device corresponds to each card 304. When a plurality of devices are provided on the card 304, the device allowable temperature table 403 may be stored for a device having the lowest allowable temperature among the plurality of devices.

  The allowable temperature of each device varies from device to device. For example, the allowable temperature of device A is stored as 40 ° C. when the ambient temperature is 5 ° C., 41 ° C. when the ambient temperature is 6 ° C., and 73 ° C. when the ambient temperature is 42 ° C. For device B and device Z, the permissible temperature corresponding to each ambient temperature is stored.

(Example of hardware configuration of control card)
FIG. 6 is an explanatory diagram illustrating an example of a hardware configuration of the control card. The control card 250 includes a CPU (Central Processing Unit) 601, a memory 602, and an interface 603. The CPU 601, the memory 602, and the interface 603 are connected by a bus (not shown).

  The CPU 601 governs overall control of the control card 250. The memory 602 includes, for example, a main memory and an auxiliary memory. The main memory is, for example, a RAM (Random Access Memory). The main memory is used as a work area for the CPU 601. The auxiliary memory is a non-volatile memory such as a magnetic disk, an optical disk, or a flash memory. Various programs for operating the control card 250 are stored in the auxiliary memory. The program stored in the auxiliary memory is loaded into the main memory and executed by the CPU 601.

  The interface 603 is an interface that performs communication with the card 304 in order to input a temperature detection result from another card 304, for example. The interface 603 is controlled by the CPU 601.

  The first measurement unit 121, the second measurement unit 122, the third measurement unit 123, the determination unit 124, the output unit 125, and the control unit 127 illustrated in FIG. 1 are stored in the memory 602. Is executed by causing the CPU 601 to execute the function. In addition, the processing result of each functional unit is stored in the memory 602. The storage unit 126 is realized by the memory 602.

  Further, the temperature collection unit 401 and the filter replacement determination unit 402 shown in FIG. 4 realize their functions by causing the CPU 601 to execute a program stored in the memory 602. In addition, the processing result of each functional unit is stored in the memory 602. The device allowable temperature table 403 is realized by the memory 602.

(Example of filter abnormality detection processing performed by the control device according to the first embodiment)
FIG. 7 is a flowchart of an example of a filter abnormality detection process performed by the control device according to the first embodiment. As shown in FIG. 7, the control apparatus 100 (control card 250) waits until it starts (step S701: No). When the device itself is activated (step S701: Yes), the control device 100 starts a temperature acquisition timer when measuring the period (for example, several minutes) for acquiring the surface temperature of the card 304 (device) from the device temperature sensor 311. (Step S702).

  Then, the control device 100 determines whether or not the temperature acquisition timer has expired (step S703). The control device 100 waits until the temperature acquisition timer expires (step S703: No), and when the temperature acquisition timer expires (step S703: Yes), measures the device surface temperature and the ambient temperature (step S704). ). Next, the control apparatus 100 refers to the device allowable temperature table 403 (see FIG. 5), and acquires the allowable temperature of each device based on the ambient temperature (step S705).

  Then, the control device 100 compares the surface temperature and the allowable temperature for each device (step S706), and determines whether the surface temperature of the device is equal to or lower than the allowable temperature (step S707). When the surface temperature of the device is equal to or lower than the allowable temperature (step S707: Yes), the control device 100 proceeds to step S709. When the surface temperature of the device exceeds the allowable temperature (step S707: No), the control device 100 issues a filter replacement notification for prompting replacement or cleaning of the fan unit 303 (step S708). The filter replacement notification is notified from the notification unit included in the control device 100, or is notified from the monitoring device 230 when a signal indicating filter abnormality is transmitted to the monitoring device 230.

  Then, the control device 100 determines whether or not it has been terminated (shut down) (step S709). When the device itself has not ended (step S709: NO), the control device 100 proceeds to step S702. When the control apparatus 100 ends (step S709: Yes), the control device 100 ends the filter abnormality detection process.

  As described above, according to the first embodiment, the abnormality determination standard for the surface temperature of the device is adjusted according to the ambient temperature of the device such as the outside air temperature, so that it is accurately distinguished from the fluctuation of the ambient temperature. 302 abnormalities can be detected. For example, when the ambient temperature is low, such as in winter, the surface temperature of the device is also low. Therefore, even if the dust filter 302 is clogged, it is difficult to detect clogging of the dust filter 302.

  In the first embodiment, since the allowable temperature is lowered according to the ambient temperature, the clogging of the dustproof filter 302 can be detected even in an environment where the ambient temperature is low. Further, by notifying the monitoring device 230 of the filter replacement, the maintenance person can grasp the appropriate replacement time of the dustproof filter 302. Thereby, the maintenance person can replace or clean the dustproof filter 302 appropriately.

(Embodiment 2)
Next, a second embodiment will be described. In the second embodiment, a case will be described in which the rotational speed of the fan unit 303 is set to a plurality of stages and the rotational speed of the fan unit 303 is changed to detect an abnormality of the dustproof filter 302. In the second embodiment, parts different from the first embodiment will be described.

(Configuration of control system according to the second embodiment)
FIG. 8 is an explanatory diagram of an example of the configuration of the control system according to the second embodiment. In FIG. 8, the control card 250 has a fan control unit 800. The fan control unit 800 uses the fan unit 303 based on the comparison result between the surface temperature of each card 304 detected by the device temperature sensor 311 and the allowable temperature stored in the device allowable temperature table 801 (see FIG. 9). Change the rotation speed. In the device allowable temperature table 801, the allowable temperature of each device is lower than the device allowable temperature table 403 (see FIG. 5) in the first embodiment.

  Specifically, the fan control unit 800 determines whether or not the surface temperature of each card 304 detected by the device temperature sensor 311 has exceeded each allowable temperature corresponding to the ambient temperature detected by the ambient temperature sensor 312. To do. The fan control unit 800 increases the rotational speed of the fan unit 303 when the surface temperature exceeds the allowable temperature. The number of rotations is a plurality of stages, and the fan control unit 800 may increase the number of rotations of the fan unit 303 stepwise until the surface temperature becomes equal to or lower than the allowable temperature.

  Fan control unit 800 outputs rotation speed information of fan unit 303 to filter replacement determination unit 402. The filter replacement determination unit 402 determines that it is time to replace the dustproof filter 302 when the surface temperature exceeds the allowable temperature even though the fan unit 303 has reached the maximum speed under the control of the fan control unit 800. The filter replacement is notified to the monitoring device 230.

  Note that the fan control unit 800 realizes its function by causing the CPU 601 to execute a program stored in the memory 602. The device allowable temperature table 801 is realized by the memory 602. The fan control unit 800 is realized by the control unit 127 shown in FIG.

(Example of stored contents of device allowable temperature table according to the second embodiment)
FIG. 9 is an explanatory diagram of an example of the storage contents of the device allowable temperature table according to the second embodiment. In the device allowable temperature table 801 shown in FIG. 9, the allowable temperatures of the devices are all lower by 3 ° C., for example, than the device allowable temperature table 403 (see FIG. 5) in the first embodiment. This is because, for example, in the second embodiment, the rotational speed of the fan unit 303 is increased based on the detection result of the surface temperature, that is, the cooling performance is improved as compared with the first embodiment. .

  For example, the allowable temperature of device A is stored as 37 ° C. when the ambient temperature is 5 ° C., 38 ° C. when the ambient temperature is 6 ° C., and 70 ° C. when the ambient temperature is 42 ° C. The allowable temperature of device B is stored as 30 ° C. when the ambient temperature is 5 ° C., 31 ° C. when the ambient temperature is 6 ° C., and 57 ° C. when the ambient temperature is 42 ° C. Similarly, for device Z, an allowable temperature corresponding to each ambient temperature is stored.

(Example of filter abnormality detection processing performed by the control device according to the second embodiment)
FIG. 10A is a flowchart (part 1) illustrating an example of a filter abnormality detection process performed by the control device according to the second embodiment. FIG. 10B is a flowchart (part 2) illustrating an example of a filter abnormality detection process performed by the control device according to the second embodiment. As shown in FIGS. 10A and 10B, the control device 100 (control card 250) waits until it starts (step S1001: No). When the device itself is activated (step S1001: Yes), the control device 100 starts a temperature acquisition timer when measuring the period (for example, several minutes) for acquiring the surface temperature of the card 304 (device) from the device temperature sensor 311. (Step S1002).

  Then, the control device 100 determines whether or not the temperature acquisition timer has expired (step S1003). The control device 100 waits until the temperature acquisition timer expires (step S1003: No), and when the temperature acquisition timer expires (step S1003: Yes), measures the device surface temperature and the ambient temperature (step S1004). ). Next, the control device 100 refers to the device allowable temperature table 801 (see FIG. 9), and acquires the allowable temperature of each device based on the ambient temperature (step S1005).

  Then, the control device 100 compares the surface temperature and the allowable temperature for each device (step S1006), and determines whether the surface temperature of the device is equal to or lower than the allowable temperature (step S1007). When the surface temperature of the device is equal to or lower than the allowable temperature (step S1007: Yes), the control device 100 determines whether the surface temperature of all devices is equal to or lower than the allowable temperature −5 ° C. (step S1008). The allowable temperature of all devices of −5 ° C. or lower indicates that the dustproof filter 302 is in a normal state without clogging.

  When the surface temperature of all the devices is not the allowable temperature −5 ° C. or less (step S1008: No), the control device 100 proceeds to step S1011. When the surface temperature of all devices is equal to or lower than the allowable temperature −5 ° C. (step S1008: Yes), the control device 100 decelerates the rotation speed of the fan unit 303 (step S1009). In step S1009, when the number of rotations is three or more, the number of rotations of the fan unit 303 may be reduced by one step. When the number of rotations of the fan unit 303 is two steps of high speed and low speed, low speed operation is performed. Should be held.

  Then, the control device 100 determines whether or not it has been terminated (shut down) (step S1010). When the device itself has not ended (step S1010: No), the control device 100 clears the excess counters of all devices (step S1011), and proceeds to step S1002. As will be described in detail with reference to FIG. 10B, the excess counter is the number of times (the number of times the device has exceeded the allowable temperature) to be monitored when the surface temperature of the device exceeds the allowable temperature. When the control apparatus 100 ends (step S1010: Yes), the control device 100 ends the filter abnormality detection process.

  In step S1007, when the surface temperature of the device exceeds the allowable temperature (step S1007: No), the control device 100 determines whether or not the rotational speed of the fan unit 303 is maximum (step S1021). When the rotation speed of the fan unit 303 is the maximum (step S1021: Yes), the control device 100 proceeds to step S1029. When the rotational speed of the fan unit 303 is not the maximum (step S1021: No), the control device 100 increases the rotational speed of the fan unit 303 (step S1022).

  Further, the control device 100 increments the excess counter indicating the number of times of monitoring the device exceeding the allowable temperature by 1 (step S1023). Then, the control device 100 starts an allowable temperature excess timer when measuring the period (for example, 1 minute) for acquiring the surface temperature of the device from the device temperature sensor 311 of the device exceeding the allowable temperature (step S1024).

  Then, control device 100 determines whether or not the allowable temperature excess timer has expired (step S1025). The control device 100 waits until the allowable temperature excess timer expires (step S1025: No), and when the allowable temperature excess timer expires (step S1025: Yes), measures the device surface temperature of the device that exceeds the allowable temperature (step S1025: Yes). Step S1026).

  Then, the control device 100 determines whether or not the surface temperature of the device that exceeds the allowable temperature is equal to or lower than the allowable temperature (step S1027). When the surface temperature of the device is equal to or lower than the allowable temperature (step S1027: Yes), the control device 100 proceeds to step S1008. When the surface temperature of the device exceeds the allowable temperature (step S1027: No), the control device 100 determines whether or not the excess counter indicating the number of times of monitoring is “5” (step S1028).

  When the excess counter indicating the number of times of monitoring is not “5” (step S1028: No), the control device 100 proceeds to step S1022. In step S1022, when the rotational speed of the fan unit 303 is three or more, the rotational speed of the fan unit 303 may be further increased, and the rotational speed of the fan unit 303 is two stages of high speed and low speed. In such a case, the high speed state may be maintained. When the excess counter indicating the number of times of monitoring is “5” (step S1028: Yes), the control device 100 issues a filter replacement notification (step S1029), and proceeds to step S1010.

  In the above-described processing, as shown in Step S1007: No → Step S1021: No → Step S1022, when the surface temperature of the device is higher than the allowable temperature, the rotational speed of the fan unit 303 is increased. This can be expected to reduce the surface temperature of the device. However, even if the rotational speed of the fan unit 303 is increased, the surface temperature of the device may exceed the allowable temperature as shown in step S1027: No. In this case, there is a possibility that the dustproof filter 302 is clogged, but it is not determined that the dustproof filter 302 is clogged in one determination.

  Even if the number of rotations of the fan unit 303 is increased to improve the accuracy of the determination, as shown in step S1028: Yes, when the surface temperature exceeds the allowable temperature for five consecutive times, the dustproof filter 302 is It is determined that the filter is clogged, and the replacement of the dust filter 302 is notified. Further, when the rotation speed of the fan unit 303 is increased and the temperature becomes lower than the allowable temperature by monitoring less than 5 times, the excess counter is cleared and monitoring is resumed as shown in step S1011 → step S1002.

  In addition, the state where the rotation speed of the fan unit 303 is high continues, and as shown in step S1008: Yes → step S1009, when the surface temperature of all devices is equal to or lower than the allowable temperature −5 ° C., the fan unit 303 rotates. The number is decelerated and the normal state is maintained.

  As described above, according to the second embodiment, it is possible to output a signal indicating the abnormality of the dustproof filter 302 by maximizing the rotation speed of the fan unit 303, and to determine whether to output a filter replacement notification. The conditions can be aligned. For this reason, the detection accuracy of the abnormality of the dust filter 302 can be improved.

  In addition, when the surface temperature of the device exceeds the allowable temperature, the rotation speed of the fan unit 303 is increased. However, there is a risk of erroneous detection in the determination only once after the increase in the rotation speed. Increase the number of revolutions and make multiple judgments. For this reason, it becomes possible to notify the replacement time of the dustproof filter 302 more accurately.

(Embodiment 3)
Next, Embodiment 3 will be described. In the third embodiment, the rotation speed of the fan unit 303 is changed, and the device surface temperature determination time (monitoring span and number of monitoring) is changed based on the temperature change rate (variation amount) of the device surface temperature. A case where an abnormality of the dustproof filter 302 is detected will be described. In the third embodiment, parts different from the first and second embodiments will be described.

(Configuration of control system according to Embodiment 3)
FIG. 11 is an explanatory diagram of an example of the configuration of the control system according to the third embodiment. In FIG. 11, the control card 250 has an excess threshold table 1100. The excess threshold table 1100 is a table in which the temperature change rate of the device surface temperature, the device surface temperature monitoring span (excess timer threshold), and the number of monitoring times (excess counter threshold) are associated with each other. This will be described later with reference to FIG.

  The filter replacement determination unit 402 refers to the excess threshold table 1100 and monitors the target device with the monitoring span and the number of times of monitoring according to the temperature change rate (increase rate) of the surface temperature of the device. The monitoring span is, for example, 5 to 60 seconds. The number of times of monitoring is, for example, 1 to 6 times.

  For example, when the temperature change rate (temperature rise rate) of the surface temperature of the device is the highest, the monitoring span of the target device is set to the shortest 5 seconds, and the number of times of monitoring is set to one. The filter replacement determination unit 402 shortens the monitoring span and decreases the number of times of monitoring as the temperature increase rate is higher, so that the filter replacement determination unit 402 can promptly replace the filter at an early stage in an emergency where the temperature increase rate is high. ing.

  Fan control unit 800 refers to excess threshold table 1100 when the number of rotations of fan unit 303 is three or more, and shortens the period for switching the number of rotations as the temperature increase rate increases. The excess threshold table 1100 is realized by the memory 602 illustrated in FIG.

(Example of stored contents of excess threshold table)
FIG. 12 is an explanatory diagram of an example of the contents stored in the excess threshold table. In FIG. 12, an excess threshold table 1100 has a temperature change rate field, an excess timer threshold field, and an excess counter threshold field. By setting information in these fields, the excess threshold table 1100 stores threshold data 1201-1 to 1201-z for each combination of the temperature change rate, the excess timer threshold, and the excess counter threshold. Yes.

  The rate of temperature change is the rate of increase of the surface temperature of the device per predetermined time, and can be expressed as plus when it rises and minus when it falls. Specifically, the temperature change rate is a value such as −10 ° C./min, −5 ° C./min, 0 ° C./min, 5 ° C./min, 10 ° C./min.

  The excess timer threshold indicates a period for acquiring the surface temperature of the device from the device temperature sensor 311 of the device exceeding the allowable temperature. The excess timer threshold value is, for example, a value such as 5 seconds, 10 seconds, 30 seconds, or 60 seconds, and the smaller the temperature change rate, that is, the lower the temperature. That is, as the temperature rises, the monitoring span is shortened. For example, when the rotational speed of the fan unit 303 is three or more, the period for switching the rotational speed can be shortened.

  The excess counter threshold indicates the number of times a device exceeding the allowable temperature is monitored when the surface temperature of the device exceeds the allowable temperature. The excess counter threshold is a value such as 0 times, 1 time, 5 times, and the like, for example, and becomes smaller as the temperature change rate is higher, that is, as the temperature rises. That is, as the temperature rises, the number of times of monitoring is reduced, and the filter replacement can be promptly promoted.

(Example of filter abnormality detection processing performed by the control device according to the third embodiment)
FIG. 13A is a flowchart (part 1) illustrating an example of a filter abnormality detection process performed by the control device according to the third embodiment. FIG. 13B is a flowchart (part 2) illustrating an example of a filter abnormality detection process performed by the control device according to the third embodiment. As shown in FIGS. 13A and 13B, the control device 100 (control card 250) waits until it starts (step S1301: No). When the device itself starts (step S1301: Yes), the control device 100 starts a temperature acquisition timer when measuring the period (for example, several minutes) for acquiring the surface temperature of the card 304 (device) from the device temperature sensor 311. (Step S1302).

  Then, the control device 100 determines whether or not the temperature acquisition timer has expired (step S1303). The control device 100 waits until the temperature acquisition timer expires (step S1303: No). When the temperature acquisition timer expires (step S1303: Yes), the control device 100 initializes a pre-holding memory that stores the previously measured surface temperature. (Step S1304).

  Then, the control device 100 measures each temperature of the device surface temperature and the ambient temperature (step S1305). Next, the control device 100 refers to the device allowable temperature table 801 (see FIG. 9), and acquires the allowable temperature of each device based on the ambient temperature (step S1306).

  Then, the control device 100 compares the surface temperature and the allowable temperature for each device (step S1307), and determines whether the surface temperature of the device is equal to or lower than the allowable temperature (step S1308). When the surface temperature of the device is equal to or lower than the allowable temperature (step S1308: Yes), the control device 100 determines whether the surface temperature is equal to or lower than the allowable temperature −5 ° C. for all devices (step S1309).

  When the surface temperature is not less than the allowable temperature −5 ° C. for all devices (step S1309: No), the control device 100 proceeds to step S1312. When the surface temperature is equal to or lower than the allowable temperature −5 ° C. for all devices (step S1309: Yes), the control device 100 decelerates the rotational speed of the fan unit 303 (step S1310). Next, the control device 100 determines whether or not itself has been terminated (shut down) (step S1311).

  When the device itself has not ended (step S1311: No), the control device 100 clears the excess counters of all devices (step S1312), and proceeds to step S1302. When the control apparatus 100 ends (step S1311: Yes), the control device 100 ends the filter abnormality detection process.

  In step S1308, when the surface temperature of the device exceeds the allowable temperature (step S1308: No), the control device 100 sets 0 ° C./min as the initial value of the temperature change rate (step S1321). And the control apparatus 100 determines whether the rotation speed of the fan part 303 is the maximum (step S1322). When the rotation speed of the fan unit 303 is the maximum (step S1322: Yes), the control device 100 proceeds to step S1334.

  When the rotational speed of the fan unit 303 is not the maximum (step S1322: No), the control device 100 refers to the excess threshold table 1100 and updates the excess timer threshold and the excess counter threshold according to the temperature change rate (step S1322). S1323). In step S1323, as an initial value, an excess timer threshold value: 30 seconds and an excess counter threshold value: 5 times corresponding to the temperature change rate of 0 ° C./min are set (see threshold data 1201-3 in FIG. 12). ). And the control apparatus 100 raises the rotation speed of the fan part 303 (step S1324).

  Furthermore, the control device 100 starts an allowable temperature excess timer (step S1325). Then, the control device 100 determines whether or not the allowable temperature excess timer has reached an excess timer threshold (for example, 30 seconds) (step S1326). The control device 100 waits until the allowable temperature excess timer reaches the excess timer threshold (step S1326: No). When the allowable temperature excess timer reaches the excess timer threshold (step S1326: Yes), the control device 100 determines the device surface temperature of each device. Measurement is performed (step S1327).

  And the control apparatus 100 calculates a temperature change rate (step S1328). The temperature change rate is calculated by (device surface temperature measured this time−pre-holding value) / excess timer threshold value. For example, if (device surface temperature measured this time−pre-holding value) is 2.5 ° C. and the excess timer threshold is 30 seconds, the temperature change rate is 5 ° C./min. Next, the control device 100 stores the surface temperature measured this time in the pre-holding memory (step S1329), and determines whether or not the surface temperature of all devices is equal to or lower than the allowable temperature (step S1330).

  When the surface temperature of all the devices is equal to or lower than the allowable temperature (step S1330: Yes), the control device 100 proceeds to step S1309. When even one of all devices has a surface temperature exceeding the allowable temperature (step S1330: No), the control device 100 determines whether or not the excess counter has reached the excess counter threshold (step S1331). ). In the initial value, the excess counter is zero.

  When the excess counter has not reached the excess counter threshold (step S1331: No), the control device 100 increments the excess counter of the device exceeding the allowable temperature by 1 (step S1332), and proceeds to step S1323. When the excess counter reaches the excess counter threshold (step S1331: YES), the control device 100 changes the rotation speed of the fan unit 303 to the maximum (step S1333), performs filter replacement notification (step S1334), and step S1311. Migrate to

  For example, after step S1332, if the rate of temperature change is 5 ° C./min in step S1323, the excess timer threshold is updated to 10 seconds and the excess counter threshold is updated once in step S1323 (FIG. 12). Threshold value data 1201-y). In this case, as shown in steps S1324 to S1327, the rotation speed of the fan unit 303 is increased, and the surface temperature of the device is measured after 10 seconds.

  Despite increasing the rotation speed of the fan unit 303, it is assumed that the device surface temperature has risen 0.84 (5/6) ° C. after 10 seconds without being lower than the allowable temperature (measured this time) Device surface temperature-pre-holding value = 0.84). In this case, the temperature change rate remains at 5 ° C./min. If the dustproof filter 302 is not clogged, the surface temperature of the device should be below the allowable temperature due to an increase in the rotational speed of the fan unit 303. If the temperature change rate remains at 5 ° C./min, both the excess counter and the excess counter threshold value are 1 in step S 1331, and therefore, in step S 1333, the rotation speed of the fan unit 303 is maximized and the filter replacement notification is made. Is done.

  As described above, according to the third embodiment, when the rate of temperature change is large, that is, when the urgency is high, after the rotational speed of the fan unit 303 is increased, the excess timer threshold is shortened and Reduced excess counter threshold. As a result, it is possible to notify the filter replacement promptly. Further, when the temperature change rate is small, that is, when the urgency is low, the excess timer threshold is increased after increasing the rotation speed of the fan unit 303. Thereby, the detection accuracy of the abnormality of the dustproof filter 302 can be improved.

(Embodiment 4)
Next, a fourth embodiment will be described. In the fourth embodiment, a case will be described in which an abnormality of the dustproof filter 302 is detected based on a comparison between a difference in surface temperatures of devices of a plurality of cards 304 and an allowable difference value. In the fourth embodiment, parts different from the first to third embodiments will be described.

  For example, when the dust filter 302 is clogged, the ventilation in the rack 301 is deteriorated, and the difference in the air volume becomes significant depending on the position in the rack 301, that is, the cooling performance varies depending on the position in the rack 301. For each combination of a plurality of cards 304 arranged in the rack 301, a reference difference allowable value is set, and the difference in air volume is determined by comparing the difference in surface temperature of each card 304 with the difference allowable value. Can be detected. In the fourth embodiment, even if the surface temperature of the device of each card 304 is equal to or lower than the allowable temperature, the abnormality of the dustproof filter 302 is detected by considering the difference in the air volume of each card 304 in a predetermined combination. .

(Configuration of control system according to Embodiment 4)
FIG. 14 is an explanatory diagram of an example of a configuration of a control system according to the fourth embodiment. In FIG. 14, the control card 250 has a difference allowable value table 1400. The allowable difference table 1400 is a table that stores the allowable difference values of the surface temperatures of the devices of the upper and lower cards 304, and details will be described later with reference to FIG. For example, the upper card 304 and the lower card 304 are arranged at different distances to the intake position.

  The filter replacement determination unit 402 refers to the difference allowance table 1400, calculates the difference between the surface temperatures of the devices of the upper and lower cards 304, and replaces the filter when the calculated difference exceeds the difference allowance. To be notified. The card 304 to be compared for calculating the difference is a predetermined combination. This combination is determined by a prior thermal simulation in consideration of the degree of temperature rise of the device itself of each card 304, the arrangement of each card 304, how to remove the wind, and the like. In addition, this combination is, for example, a combination of cards 304 in which the temperature difference becomes larger between when the dustproof filter 302 is clogged and when it is not clogged.

(Example of stored contents of difference tolerance table)
FIG. 15 is an explanatory diagram of an example of the contents stored in the difference allowance table. In FIG. 15, an allowable difference value table 1400 indicates the difference in device surface temperature between different cards 304 arranged at different positions in the rack 301. When the dustproof filter 302 is not clogged, in the rack 301, the card 304 disposed at each position is blown with a predetermined air volume by the fan unit 303. In addition, when the degree of the temperature rise of each device is different among the devices to be combined, even when the dustproof filter 302 is not clogged, a difference occurs in the surface temperature of each device.

  If the dust filter 302 is clogged, for example, the air volume on the intake side tends to be larger than that on the exhaust side, so that the cooling performance on the intake side (lower) is higher than that on the exhaust side (upper). . Therefore, the difference in the surface temperature of each combination is different from the difference when the dustproof filter 302 is not clogged. The allowable temperature of this difference is the allowable difference value shown in the allowable difference value table 1400.

  In the difference allowance table 1400, the difference allowance between the surface temperature of one card 304 arranged in the upper stage and the surface temperature of one card 304 arranged in the lower stage is shown. The difference allowance value is different for each combination because the wind escape method differs depending on the position where the card 304 of each combination is arranged, and the allowable temperature or the temperature rise degree of the device itself is different for each device of each card 304. Different. The allowable difference value table 1400 is realized by the memory 602 illustrated in FIG.

(Example of filter abnormality detection processing performed by the control device according to the fourth embodiment)
FIG. 16 is a flowchart illustrating an example of a filter abnormality detection process performed by the control device according to the fourth embodiment. As shown in FIG. 16, the control apparatus 100 (control card 250) waits until it starts (step S1601: No). When the control apparatus 100 starts up (step S1601: Yes), the control device 100 starts a temperature acquisition timer when measuring the period (for example, several minutes) for acquiring the surface temperature of the card 304 (device) from the device temperature sensor 311. (Step S1602).

  Then, the control device 100 determines whether or not the temperature acquisition timer has expired (step S1603). The control device 100 waits until the temperature acquisition timer expires (step S1603: No), and when the temperature acquisition timer expires (step S1603: Yes), measures each temperature of the device surface temperature and the ambient temperature (step S1604). ). Next, the control device 100 refers to the device allowable temperature table 403 (see FIG. 5) and acquires the allowable temperature of each device based on the ambient temperature (step S1605).

  Then, the control device 100 compares the surface temperature with the allowable temperature for each device (step S1606), and determines whether the surface temperature of the device is equal to or lower than the allowable temperature (step S1607). When the surface temperature of the device exceeds the allowable temperature (step S1607: No), the control device 100 issues a filter replacement notification for prompting replacement or cleaning of the fan unit 303 (step S1608), and proceeds to step S1611.

  When the surface temperature of the device is equal to or lower than the allowable temperature (step S1607: Yes), the device surface temperature of each of the upper and lower cards 304 is measured (step S1609). And the control apparatus 100 calculates a difference value for every predetermined combination about the measured surface temperature, refers to the difference allowable value table 1400 (refer FIG. 15), and a difference value is below a difference allowable value about each. It is determined whether or not (step S1610).

  When the difference value exceeds the difference allowable value (step S1610: No), the control device 100 proceeds to step S1608. When the difference value is equal to or less than the difference allowable value (step S1610: Yes), the control device 100 determines whether or not the control device 100 has ended (shut down) (step S1611). When the device itself has not ended (step S1611: No), the control device 100 proceeds to step S1602. When the control apparatus 100 ends itself (step S1611: Yes), the control device 100 ends the filter abnormality detection process.

  In the above-described processing, when the surface temperature of the device is equal to or lower than the allowable temperature (step S1607: Yes), it is determined whether the difference value is equal to or lower than the allowable difference value (step S1610). Not limited to this. For example, when the surface temperature of the device exceeds the allowable temperature (step S1607: No), it may be determined whether the difference value is equal to or less than the allowable difference value.

  With such a configuration, when the surface temperature of the device of each of the upper and lower cards 304 exceeds a threshold value according to the ambient temperature, and the difference value exceeds the allowable difference value for each, filter replacement is performed. Notification can be made. Therefore, the detection accuracy of the abnormality of the dust filter 302 can be improved.

  Further, in the above-described processing, similarly to the second embodiment, the rotational speed of the fan unit 303 may be changed by setting the rotational speed of the fan unit 303 in a plurality of stages. Specifically, when the difference value exceeds the allowable difference value (step S1610: No), the fan unit 303 is increased in speed, and then it is determined again whether the differential value exceeds the allowable difference value. Filter replacement notification may be performed when the value exceeds the allowable difference value. Thereby, the detection accuracy of the abnormality of the dustproof filter 302 can be improved.

  As described above, according to the fourth embodiment, even when the device surface temperature of each card 304 is equal to or lower than the allowable temperature, the difference between the surface temperatures of the devices in each combination is equal to or lower than the allowable difference value. Can be determined to be abnormal. Therefore, the abnormality can be detected in consideration of the difference in the air volume in the rack 301, the variation of the abnormality detection of the dust filter 302 can be increased, and the abnormality of the dust filter 302 can be easily detected.

  For example, even when the dustproof filter 302 is clogged, the surface temperature of the device does not exceed the allowable temperature by rotating the fan unit 303 at a high speed if the capability of the fan unit 303 is high. There is. Even in such a case, when the difference in the surface temperature of the device of each card 304 exceeds the allowable difference value, it can be determined that the dustproof filter 302 is abnormal and notified.

  The following additional notes are disclosed with respect to the above-described first to fourth embodiments.

(Appendix 1) a filter provided at an intake position of a rack that houses an electronic device;
A first measurement unit for measuring the temperature of the electronic device;
A second measuring unit for measuring a temperature around the electronic device;
Based on the temperatures measured by the first measurement unit and the second measurement unit when air is taken into the rack from the intake position by the blower, the temperature of the electronic device is changed to the ambient temperature. A determination unit for determining whether or not a predetermined temperature has been exceeded,
An output unit that outputs a signal indicating an abnormality of the filter when the determination unit determines that the temperature of the electronic device exceeds the predetermined temperature;
A device characterized by comprising:

(Additional remark 2) It has a memory | storage part which memorize | stores the correspondence information which matched the said surrounding temperature and threshold value,
The determination unit acquires a threshold value corresponding to the ambient temperature measured by the second measurement unit from the correspondence information stored in the storage unit, and acquires the acquired threshold value and the temperature of the electronic device. The apparatus according to claim 1, wherein whether or not the temperature of the electronic device exceeds the predetermined temperature is determined based on the comparison.

(Additional remark 3) The said judgment part is based on the comparison using the correction value according to the said surrounding temperature, the predetermined threshold value, and the temperature of the said electronic device, and the temperature of the said electronic device uses the said predetermined temperature. The apparatus according to appendix 1, wherein it is determined whether or not it has been exceeded.

(Additional remark 4) It has a control part which controls the air volume of the air blower according to the temperature of the electronic device,
The determination unit determines whether the control state of the air volume controlled by the control unit is a predetermined state and whether the temperature of the electronic device exceeds a predetermined temperature according to the ambient temperature,
The output unit is
When the determination unit determines that the control state is the predetermined state and the temperature of the electronic device exceeds the predetermined temperature, the signal is output,
Any one of appendices 1 to 3, wherein the signal is not output when the control unit determines that the control state is the predetermined state and the temperature of the electronic device does not exceed the predetermined temperature. The device described.

(Supplementary Note 5) The determination unit is the same as or different from the predetermined temperature (referred to as “first predetermined temperature”) in which the control state is not the predetermined state and the temperature of the electronic device is in accordance with the ambient temperature. The supplementary note 4, wherein when it is determined that the second predetermined temperature has been exceeded, the control state is set to the predetermined state, and it is determined whether or not the temperature of the electronic device has exceeded the first predetermined temperature. apparatus.

(Supplementary Note 6) The determination unit determines whether or not the duration of the state in which the temperature of the electronic device exceeds the predetermined temperature is equal to or longer than a determination time according to the variation amount of the temperature of the electronic device,
The determination time includes a determination time corresponding to a predetermined amount of the variation (referred to as “first determination time”), and a determination time corresponding to the variation smaller than the predetermined amount and longer than the first determination time. (Referred to as “second judgment time”),
The output unit is
When the determination unit determines that the duration is equal to or longer than the determination time, a signal indicating abnormality of the filter is output,
The apparatus according to any one of appendices 1 to 5, wherein when the determination unit does not determine that the duration is equal to or longer than the determination time, a signal indicating abnormality of the filter is not output.

(Additional remark 7) The said determination part changes the said determination time according to the said variation | change_quantity in the said determination time, The apparatus of Additional remark 6 characterized by the above-mentioned.

(Additional remark 8) It has the 3rd measurement part which measures the temperature of the electronic device of the 2nd electronic device arranged near the inhalation position rather than the electronic device (referred to as "the 1st electronic device"),
The determination unit determines whether a difference between the temperatures measured by the first measurement unit and the third measurement unit exceeds a predetermined value;
The apparatus according to any one of appendices 1 to 7, wherein the output unit outputs the signal when the determination unit determines that the difference exceeds the predetermined value.

(Appendix 9) Based on the temperature of the electronic device and the temperature around the electronic device measured when air is taken into the rack by a blower from the intake position of the rack that houses the electronic device, the electronic device If the temperature of the electronic device exceeds a predetermined temperature corresponding to the ambient temperature, and if it is determined that the temperature of the electronic device exceeds the predetermined temperature, an abnormality of a filter provided at the intake position of the rack is determined. A first device for transmitting a signal indicating via a network or a dedicated line;
A second device for outputting a signal indicating abnormality of the filter received from the first device;
The system characterized by having.

DESCRIPTION OF SYMBOLS 100 Control apparatus 110,301 Rack 111 1st electronic device 112 2nd electronic device 113 Filter 114 Blower 121 1st measurement part 122 2nd measurement part 123 3rd measurement part 124 Judgment part 125 Output part 126 Storage part 127 Control part 131, 312 Ambient temperature sensor 200 System 230 Monitoring device 250 Control card 302 Dust-proof filter 303 Fan unit 304 Card 401 Temperature collection unit 402 Filter replacement determination unit 403,801 Device allowable temperature table 410 Network 601 CPU
602 Memory 603 Interface 800 Fan control unit 1100 Excess threshold table 1400 Allowable difference table

Claims (8)

A filter provided at an intake position of a rack that houses an electronic device;
A first measurement unit for measuring the temperature of the electronic device;
A second measuring unit for measuring a temperature around the electronic device;
Based on the temperatures measured by the first measurement unit and the second measurement unit when air is taken into the rack from the intake position by the blower, the temperature of the electronic device is changed to the ambient temperature. A determination unit for determining whether or not a predetermined temperature has been exceeded,
An output unit that outputs a signal indicating an abnormality of the filter when the determination unit determines that the temperature of the electronic device exceeds the predetermined temperature;
A device characterized by comprising: A storage unit that stores correspondence information in which the ambient temperature is associated with a threshold;
The determination unit acquires a threshold value corresponding to the ambient temperature measured by the second measurement unit from the correspondence information stored in the storage unit, and acquires the acquired threshold value and the temperature of the electronic device. The apparatus according to claim 1, wherein it is determined whether or not a temperature of the electronic device exceeds the predetermined temperature based on the comparison. A control unit for controlling the air volume of the blower according to the temperature of the electronic device;
The determination unit determines whether the control state of the air volume controlled by the control unit is a predetermined state and whether the temperature of the electronic device exceeds a predetermined temperature according to the ambient temperature,
The output unit is
When the determination unit determines that the control state is the predetermined state and the temperature of the electronic device exceeds the predetermined temperature, the signal is output,
3. The apparatus according to claim 1, wherein the signal is not output when the control unit determines that the control state is the predetermined state and the temperature of the electronic device does not exceed the predetermined temperature.   The determination unit includes a second predetermined temperature that is the same as or different from the predetermined temperature (referred to as a “first predetermined temperature”), in which the control state is not the predetermined state and the temperature of the electronic device is in accordance with the ambient temperature. 4. The apparatus according to claim 3, wherein when it is determined that the temperature exceeds, the control state is set to the predetermined state, and it is determined whether or not a temperature of the electronic device exceeds the first predetermined temperature. The determination unit determines whether or not the duration of the state in which the temperature of the electronic device exceeds the predetermined temperature is equal to or longer than a determination time according to the variation amount of the temperature of the electronic device,
The determination time includes a determination time corresponding to a predetermined amount of the variation (referred to as “first determination time”), and a determination time corresponding to the variation smaller than the predetermined amount and longer than the first determination time. (Referred to as “second judgment time”),
The output unit is
When the determination unit determines that the duration is equal to or longer than the determination time, a signal indicating abnormality of the filter is output,
The apparatus according to any one of claims 1 to 4, wherein if the determination unit does not determine that the duration is equal to or longer than the determination time, a signal indicating abnormality of the filter is not output.   The apparatus according to claim 5, wherein the determination unit changes the determination time according to the variation amount within the determination time. A third measuring unit that measures the temperature of the electronic device of the second electronic device disposed closer to the intake position than the electronic device (referred to as "first electronic device");
The determination unit determines whether a difference between the temperatures measured by the first measurement unit and the third measurement unit exceeds a predetermined value;
The apparatus according to claim 1, wherein the output unit outputs the signal when the determination unit determines that the difference exceeds the predetermined value. Based on the temperature of the electronic device measured when air is taken into the rack by a blower from the intake position of the rack that houses the electronic device, and the temperature around the electronic device, the temperature of the electronic device is It is determined whether or not a predetermined temperature corresponding to the ambient temperature has been exceeded, and when it is determined that the temperature of the electronic device has exceeded the predetermined temperature, a signal indicating an abnormality of a filter provided at the intake position of the rack, A first device for transmitting over a network or dedicated line;
A second device for outputting a signal indicating abnormality of the filter received from the first device;
The system characterized by having.

Images